/Engine/Source/Editor/LevelEditor/Public/LightmapResRatioAdjust.h
Add levels in a world to an array based on the LevelOptions setting
void AddRequiredLevels ( [AdjustLevels](API\Editor\LevelEditor\FLightmapResRatioAdjustSettings\AdjustLevels) InLevelOptions, [UWorld](API\Runtime\Engine\Engine\UWorld) * World, [TArray](API\Runtime\Core\Containers\TArray)< [ULevel](API\Runtime\Engine\Engine\ULevel) * > & OutLevels )